Welding Exhaust
Welding Exhaust
(OP)
Owner wants a 10'X10' welding area in the corner of their shop. If it is 10' high and I treat it like a walk-in hood with one open side and exhaust on the wall opposite that's 10,000CFM (based on 100FPM). I'm trying to talk them into local exhaust.
Anyone do anything similar?
Anyone do anything similar?





RE: Welding Exhaust
How many welders are working in the booth?
What welding process i.e. Stick, Mig, Tig.
The last two methods are sensitive to drafts in the work area.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Welding Exhaust
It is not a local exhaust and treating it like it is a bad idea.
RE: Welding Exhaust
Am I missing something?
This is for a machinery repair shop in an industrial plant. It is not an assembly area where the welding is the same all the time.
RE: Welding Exhaust
how did you select a required cfm based on the air velocity?
I googled some information about weld fume control and found on the following link
http
there is a hood package with product data, the size is (13'x 6.5')
which is about 85 sq.ft, they said that it needs 3500 cfm.
RE: Welding Exhaust
Now that you say it I am not sure where I got 100FPM. The place I thought it was in Industrial Ventilation actually says 125CFM/SF face which is worse.
Thanks for the cut. I will check it out.
I have been looking at a Plymovent local exhaust unit.
RE: Welding Exhaust
I have used the Plymovent units. They are generally wall mounted with a boom and counterweight for the duct. Used properly they will keep a shop free of smoke and fumes.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Welding Exhaust
Capturing fumes is all about the "capture velocity". I don't recall what the velocity is for welding fumes, but you are on the right track with your thinking. Now, here's where I think my idea will help you:
Construct a hood to cover the entire 10'x10' welding area, but put a plate in the bottom of the hood so that most of the opening in blanked off. You will have to weld straps or come up with a way to support the plate. This will leave you with just a perimeter slot around the 10'x10' welding area. How big should the slot be? I don't know off hand, but probably 2" wide. You will need to consult an Industrial Ventilation handbook for the cals.
With this setup, you only need to have enough capture velocity across the slots and not throughout the overall 10'x10' area. This dramatically reduces the total CFM! Any fumes that hit the plate will migrate horizontally and get sucked up through the slot.
I put a light on the the one I designed because the hood was blocking the overhead lighting.
If you have a door open or a fan blowing, etc, the fumes may be blown out of the welding area and not get captured. Likewise, if the hood it too high, the fumes may escape before being captured by the slot velocity.
Hope this helps!
RE: Welding Exhaust
RE: Welding Exhaust
RE: Welding Exhaust